| + | ** Improvement: [[Type 0 Observation Seaplane]], [[Type 21 Air Radar Kai]], [[New Kanhon Design Anti-torpedo Bulge (Large)]], [[10cm Twin High-angle Gun Mount Kai + Additional Machine Guns]], [[51cm Twin Gun Mount]] |
| + | ** Improvement & upgrade: [[46cm Triple Gun Mount]], [[15.5cm Triple Secondary Gun Mount]], [[Anti-torpedo Bulge (Large)]], [[Prototype 46cm Twin Gun Mount]], [[Prototype 51cm Twin Gun Mount]], [[15.5cm Triple Secondary Gun Mount Kai]], [[46cm Triple Gun Mount Kai]] |